Answer:
The correct answer is Health Psychologist.
Step-by-step explanation:
Health psychology is the study of the psychological impact in health, in illnes and in healthcare, and the relation there's between the behavioral process in these three aspects mentioned above, it analyzes the phenomena that is the understanding that health is not only related to biological processes but also psychological, therefore Helen is likely a Health psychologist because that is the field of study of her psychological research, the impact of psychological aspects on health and diseases like cancer and heart disease.